43479885809 has 2 divisors, whose sum is σ = 43479885810. Its totient is φ = 43479885808.

The previous prime is 43479885751. The next prime is 43479885821. The reversal of 43479885809 is 90858897434.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36242640625 + 7237245184 = 190375^2 + 85072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43479885809 is a prime.

It is not a weakly prime, because it can be changed into another prime (43479845809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21739942904 + 21739942905.

It is an arithmetic number, because the mean of its divisors is an integer number (21739942905).

Almost surely, 2^43479885809 is an apocalyptic number.

It is an amenable number.

43479885809 is a deficient number, since it is larger than the sum of its proper divisors (1).

43479885809 is an equidigital number, since it uses as much as digits as its factorization.

43479885809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69672960, while the sum is 65.

The spelling of 43479885809 in words is "forty-three billion, four hundred seventy-nine million, eight hundred eighty-five thousand, eight hundred nine".